[Spok]

"The Crusaders proved once and for all the fallacy of the Catholic Religion."

The Crusades only proved the fallacy of mankind, which we already about.

[SampleMan]

The Crusades didn't go so badly as counterattacks go. Muslims driven out of France, Spain, Italy and turned back in the Balkans.

If your point is that the Catholic Church is disproved as a valid religion by the failings of its members, then you perhaps you are mistaken about the point of religion.